python: signal: remove unneeded scopedlock
python: signal: remove unneeded scopedlock

Change-Id: I6b74be712d5831e5d2134cdb179aa2e44cc609c1
Reviewed-on: http://gerrit.aldebaran.lan/25021
Reviewed-by: hcuche <2a0975cc082cedff4d4350e3f6ec187146151bc6@aldebaran-robotics.com>
Tested-by: ncornu <13ba26b8f12d26c819f48749c65f2f7f5c1d13db@aldebaran-robotics.com>
Reviewed-on: http://gerrit.aldebaran.lan/25111
Reviewed-by: ncornu <13ba26b8f12d26c819f48749c65f2f7f5c1d13db@aldebaran-robotics.com>

aldebaran/libqi,vbarbaresi/libqi,aldebaran/libqi,aldebaran/libqi,bsautron/libqi